Putting a RJ85 into DND will be a bigger logistical exercise than many of you seem to appreciate.
The RJs are operated by CityJet and the D328s are operated by Scot Airways under a CityJet franchise. Therefore if CityJet set up shop in DND with an RJ85, they will need to start up a base from scratch since they have no direct involvement with DND. That involves cash and recruitment etc etc - can't see it taking place really!